<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=no">
    <meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">
    <meta name="author" content="姚德秋">
    <title></title>
    <style>
         body{
             width: 750px;
             margin: 100px auto;
         }
         img{
             opacity: 0.2;
         }
         img:hover{
             opacity: 1;
         }
    </style>
</head>
<body>
     <img src="1.jpg" alt="">
     <img src="2.jpg" alt="">
     <img src="3.jpg" alt="">
     <img src="4.jpg" alt="">
     <img src="5.jpg" alt="">
     <img src="6.jpg" alt="">
     <img src="7.jpg" alt="">
     <img src="8.jpg" alt="">
     <img src="9.jpg" alt="">
     <img src="10.jpg" alt="">
</body>
</html>